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Health Hazard Evaluations (HHEs)

Each month we will update this page to highlight newly released final reports and information on new and emerging hazards we are evaluating. Check back often to see what we are up to!

What's New

Evaluation of Heat Sealing Operations at a Plastic Film Assembly Facility
Health Hazard Program investigators found possible work-related asthma and low levels of various aldehydes in air samples. Employee symptoms improved after a change in source materials, but some continued to experience headaches and asthma-like symptoms. Finding carbon monoxide in areas with and without forklift use, we recommended properly maintaining forklifts, and conducting full-shift carbon monoxide exposure monitoring. To read the full report go to

Evaluation of Exposures in an Aircraft Refinishing Plant

Finding overexposures to hexavalent chromium and cadmium in the air and nasal tissue damage consistent with chromium exposure, HHE Program investigators recommended medically monitoring employees, improving ventilation in stripping and painting bays, and requiring the use of airline respirators for employees who apply primer or paint, or who do sanding. To read the full report go to

2016 Health Hazard Evaluation Program Annual Report
The NIOSH Health Hazard Evaluation (HHE) Program is pleased to share the 2016 annual report. The report includes summaries of interesting projects and other highlights of our year. We hope the report stimulates conversations about who the HHE Program is and how we make a difference for the health and safety of employees throughout the United States. A link to the annual report is available here:

New HHE Video Series Shows What Happens on a Site Visit
Ever wonder what happens when the Health Hazard Evaluation team visits a workplace? Watch 3 new HHE videos to get a glimpse into our activities. Each video shows a different type of testing or sampling conducted in a workplace and reactions from the employer and employees.